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homing problem in gantry mode

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25 Oct 2020 12:44 #187187 by jasen
homing problem in gantry mode was created by jasen
Hi , I have the folowing peoblem , the machine is gantry with 2 motors on Y axis. At startup when you go to homing procedure you can select independant axis or homing sequence ( not yet in joints)
The problem is that if in this moment you select to hoe Y axis (the gantry one) only one of the motors starts as is not in joint mode yet.The result is brocken machine. Haw to solve it. ?

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25 Oct 2020 14:48 - 25 Oct 2020 14:49 #187194 by newbynobi
Replied by newbynobi on topic homing problem in gantry mode
Wrong homing sequence in your INI File?
Do both Y Joints have a negative value of the homing sequence? like so?
[AXIS_Y]
MAX_VELOCITY = 80
MAX_ACCELERATION = 200
MIN_LIMIT = 0
MAX_LIMIT = 2000

[JOINT_1]
TYPE = LINEAR
MAX_VELOCITY = 200
MAX_ACCELERATION = 1000
MIN_LIMIT = 0
MAX_LIMIT = 2000
HOME = 0.0
HOME_OFFSET = 0.0
HOME_SEARCH_VEL = 0
HOME_LATCH_VEL = 0
HOME_SEQUENCE = -2

[JOINT_2]
TYPE = LINEAR
MAX_VELOCITY = 200
MAX_ACCELERATION = 1000
MIN_LIMIT = 0
MAX_LIMIT = 2000
HOME = 0.0
HOME_OFFSET = 0.0
HOME_SEARCH_VEL = 0
HOME_LATCH_VEL = 0
HOME_SEQUENCE = -2

Norbert
Last edit: 25 Oct 2020 14:49 by newbynobi.

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25 Oct 2020 16:54 #187205 by jasen
Replied by jasen on topic homing problem in gantry mode
nope , in sequence homing everiting is ok , it happend only when you try to home only the gantry axis , in my case is Y. when you push the home all , it works ok.

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25 Oct 2020 17:29 #187206 by Clive S
Replied by Clive S on topic homing problem in gantry mode

nope , in sequence homing everiting is ok , it happend only when you try to home only the gantry axis , in my case is Y. when you push the home all , it works ok.


I think that is normal with gantry homing

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25 Oct 2020 21:26 #187224 by rodw
Replied by rodw on topic homing problem in gantry mode
In you ini file
KINEMATICS = trivkins coordinates=XYYZ kinstype=BOTH

change to
KINEMATICS = trivkins coordinates=XYYZ

This removes the ability to jog in world mode so you have to home all before doing anything.

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26 Oct 2020 06:21 #187278 by newbynobi
Replied by newbynobi on topic homing problem in gantry mode
@jasen,

So does your INI file have a negative homing sequence for your Y axis? If so, pushing the home Y button should home both y joints.
This does not have anything to do with the home all behavior, as this will home all joints at once!

Post your relevant part of your INI File.

Norbert

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26 Oct 2020 17:51 #187327 by jasen
Replied by jasen on topic homing problem in gantry mode
Hi Norbert , yea , the issue was the negative home sequence , didnt see that. now is ok. But I have another question for the spindle scale. it works exact with the g-code commands , but the bar is not ok. before homing it works different than after. the spindle is standart 24000 rpm controled with 10v analog

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